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Old 12-20-2005, 04:55 PM
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vapor lock

I recentley purchased a 59 ford ,292 cu. in.
It has a two barrel carb.It had not run in appox. 4 years.I changed all fulids before I turned the engine over.I replaced the fuel pump because it was not working. I managed to get her started and it runs pretty good. Only problem is that it runs for a short time and then shuts off. It starts later after setting awhile.
I think it might be vapor locking.However, I'm not sure.
My question is ( what causes a vapor lock, and what is the fix, or could this be something else ).
I would appreciate any help that anyone could give.

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Old 12-20-2005, 05:52 PM
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Highly doubtful that its vapor lock while the engine is running. The fuel line is constantly supplied with enough fresh fuel that it shouldn't evaporate. Vapor lock is when a heat source is too close to a fuel line causing the gasoline inside to boil. Since carbs and fuel pumps don't work with gasoline vapor, the engine won't start. Typically its a hot start issue. The engine runs, gets hot, then you shut it down. The now non-moving fuel soaks up heat, evaporates, and you have trouble starting when its hot. The fix is to insulate or move the fuel line so that it doesn't happen anymore.

My guess is that you have a seriously sick carb. In fact its kindof a miracle that it runs Sunken float, dirt or rust in a jet, dried seals, vacuum leaks, any one of a dozen possibilities. Pull the carb, get a rebuild kit that includes a new float, and follow the instructions.

Its also possible that the fuel pump you bought isn't working right. About one in 20 of those parts store pumps don't work right.
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Old 12-20-2005, 07:31 PM
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Another suggestion is that your coil is bad and when it runs for a short period it heats up and causes an open in the coil, when this happens does the engine turn over but won't start, to check you can pull a spark plug wire and check for spark.

Good luck

Also check for spark after it quits running.
By the way welcome aboard
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Old 12-20-2005, 08:38 PM
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you know you could have something that is getting sucked up inside the fuel line and blocks it after a while....this happened on my buddies car and it drove us nuts trying to trouble shoot it.....turned out to be some scale that would get sucked up and then after the car died it would fall back down and start the process all over again.
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